Door-check.



J. J. DALY.

DOOR CHECK.

APPLICATION FILED DEG.30,1914.

Patented Mar. 9, 1915.

L18Lln Inventor, john f. Daly ALforney rt ears arr a] UTT@ if.

.romt a". DALY, or ew BRUNSWICK, NEW annsnr AssIGNon 'ro THE BANKER,

maNuracrunrNe COMPANY, or NEW BRUNSWICK, Nnw annsnr, a con- PORATION OF NEW JERSEY.

LT3L1122.

checked, and the other part, usually thedoor-jamb, carries an anchorage for a flexible connection with the piston.

The check is applicable especially to screen-doors, and other doors of light construction in which the hinge-line is not at too great a distance back of the face of the door to which the check is attached.

The object of the invention is to provide a form of door-check which may be readily fitted to doors of different thicknesses, in

which the springs for effecting the closure of the door are combined, in which they are protected from injury, and in which the piston is protected from oblique strain.

Tn the accompanying sheet of drawings which forms a part of this application, Figure 1 is a plan of a door just about to closev carrying a door-check embodying my invention, the cylinder being in section, and Fig. 2 is a plan with the door in full open position and the door-check being in section.

The door-check comprises a cylinder 1 with a head 2 carrying an outlet 3 from the cylinder which is adjustable by a screw 4. The head is hinged to a plate 5 which is attached to the face of the dooropposite from the hinge line 6 of the door. A piston travels in the cylinder and consists of a metal head 7 and a washer 8 screwed to the head and clamping between them a leather cuppacking 9. Both the head and the washer fit the cylinder closely and are spaced apart so as to hold the piston in alinement in the cylinder. Holes 10 10 through the washer admit air under the flange of the packing. A piston-rod 11 is connected with the pistonhead through a ball joint 12 and therefore Specification of Letters Patent.

DOOR-CHECK.

' Patented ame, teat.

Application filed December 30, 1914. Serial No. 879,628.

does not serve to hold the piston in saline- Inent, a funct1on which it cannot perform since 1t is not always guided at the mouth of the cylinder and is liable to be thrown out 01f alinement when the piston is near the bottom of the cylinder with the door closing and its momentum putting all the parts under compression. In Fig. 1, the piston-rod 1s shown out of the center line of the cylinderbecause it is wider compression and it is erect position, by a spring 16. The end of the piston-rod and the end of the arm are connected by an extensible link consisting of an outer sleeve 17 and an inner sleeve 18 telescoping together and protecting a tension spring 19 which draws the ends together.

The effectiveness of the springs in closing the door is increased by holding the line of links as far as possible from the hinge-line. On the other hand, by permitting the line of links to closely approach the hinge-line, the door can be allowed to be swung open against the wall as shown in Fig. 2 without undue length of cylinder and other parts. The spring attached to the arm which projects from the door-jamb throws the arm outward as soon as the door commences to close and thereby afi'ords suflicient leveralge for the other springs to draw the door s ut.

What I claim as new, and desire to secure by Letters Patent of the United States, is 1. In a door-check, a cylinder adapted to.

an erect position, and an extensible link connecting the end of the arm and the end ing the end of the arm and the end of the 10 of the piston-rod, substantially as described. piston-rod, substantially as described.

2. In a door-check, a cylinder adapted to Signed at New Brunswick, N. J this 29th be connected to dOOIi, a piston fititing {)hereday of December, 1914. 5 in a iston-ro a p ate a a te to e se- .cu red' to the door-jamb, an aim pivoted to JOHN DALY the plate, a spring for drawing the arm into Witnesses: 1 an erect position, and a link consisting of ALFRED S. MARCH, spring-controlled telescoping parts connect- Tnos. A. CONWAY. 

